Pressure equalizing insert

Abstract

The invention relates to a pressure equalizing insert ( 1 ) which is provided for installation in a valve ( 10 ) for regulating a fluid stream in particular in a HVAC system. The pressure equalizing insert ( 1 ) comprises a housing ( 2 ) having an actuating member ( 3 ) which is movably mounted thereon and is configured to at least partially guide the fluid stream regulated by the valve ( 10 ) and, when the pressure equalizing insert ( 1 ) is installed, co-operates with a valve seat ( 15 ) depending upon a pressure difference prevailing in the fluid stream in order to regulate the fluid stream. The invention further relates to a valve ( 10 ) having an installed pressure equalizing insert ( 1 ), wherein the pressure equalizing insert ( 1 ) can be inserted in particular as a pre-assembled assembly into the valve ( 10 ).

The invention claimed is: 
     
       1. A valve ( 10 ) for regulating a fluid stream in particular in an HVAC system, wherein the valve ( 10 ) has installed a valve element ( 12 ) for regulating the fluid stream, wherein the valve ( 10 ) has installed a pressure equalizing insert ( 1 ), wherein the pressure equalizing insert ( 1 ) is a preassembled module, wherein the pressure equalizing insert ( 1 ) comprises a housing ( 2 ) having an actuating member ( 3 ) displaceably mounted thereon and equipped to at least partially guide the fluid stream regulated by the valve ( 10 ), wherein the housing ( 2 ) has a first housing part ( 21 ) connected to a second housing part ( 22 ), wherein a membrane ( 6 ) is secured between the first housing part ( 21 ) and the second housing part ( 22 ), wherein the membrane ( 6 ) holds displaceably the actuating member ( 3 ), and wherein the actuating member ( 3 ) cooperates with a valve seat ( 15 ) to regulate the fluid stream as a function of a pressure difference prevailing in the fluid stream, wherein the pressure difference depends on a position of the valve element ( 12 ), wherein a first housing part ( 8 ) of the valve ( 10 ) comprises a first flange ( 8   f ) for connecting said valve to a first pipe, and a second housing part ( 9 ) of the valve ( 10 ) comprises a second flange ( 9   f ) for connecting said valve to a second pipe, and wherein said first flange ( 8   f ), said second flange ( 9   f ) and the pressure equalizing insert ( 1 ) are arranged in a coaxial configuration. 
     
     
       2. The valve ( 10 ) according to  claim 1 , characterized in that the actuating member ( 3 ) is arranged between an inlet opening ( 4 ) and an outlet opening ( 5 ) of the housing ( 2 ) so that the actuating member ( 3 ) is displaced relative to the valve seat ( 15 ) in accordance with a pressure difference between the pressure of a fluid stream guided in the pressure equalizing insert ( 1 ) and the pressure of a fluid stream guided outside of the pressure equalizing insert ( 1 ) for cooperation with the valve seat ( 15 ). 
     
     
       3. The valve ( 10 ) according to  claim 1 , characterized in that the actuating member ( 3 ) is held displaceably by a membrane ( 6 ), wherein the membrane ( 6 ) divides a cavity of the housing ( 2 ) into an interior fluid region (P 22 ) and a fluid region (P 23 , P 21 ) assigned to the exterior, wherein the interior fluid region (P 22 ) is fluidically connected to the fluid stream guided by the actuating member ( 3 ), wherein the fluid region (P 23 , P 21 ) assigned to the exterior is fluidically connected to an exterior region of the housing ( 2 ), wherein the actuating member ( 3 ) is prestressed by a spring element ( 7 ) and the prevailing displacement of the actuating member ( 3 ) is the result of a pressure difference between a pressure in the interior fluid region (P 22 ) and a pressure in the fluid region (P 23 , P 21 ) assigned to the exterior. 
     
     
       4. The valve ( 10 ) according to  claim 1 , characterized in that the housing ( 2 ) and the actuating member ( 3 ) are designed to be cylindrical. 
     
     
       5. The valve ( 10 ) according to  claim 1 , characterized in that the housing ( 2 ) has multiple housing parts, which can be connected to one another with one or more connecting devices. 
     
     
       6. The valve ( 10 ) according to  claim 1 , characterized in that one or more limiting devices ( 29 ,  39 ) are arranged to limit the displacement of the actuating member ( 3 ) relative to the valve seat ( 15 ). 
     
     
       7. The valve ( 10 ) according to  claim 1 , characterized in that a sealing element ( 133 ) is mounted on the inlet end between the housing ( 2 ) and the actuating member ( 3 ). 
     
     
       8. The valve ( 10 ) according to  claim 1 , characterized in that a membrane ( 6 ) for holding the actuating member ( 3 ) has one or more corrugated embossings. 
     
     
       9. The valve ( 10 ) according to  claim 1 , characterized in that the housing ( 2 ) has a first section ( 21 ), a second section ( 22 ), and a third section ( 23 ), wherein the first section ( 21 ) is equipped for sealing with respect to a housing of the valve ( 10 ), and the third section ( 23 ) is equipped to establish a fluid connection in the form of a clearance (S) between the housing ( 2 ) of the pressure equalizing insert ( 1 ) and the housing of the valve ( 10 ), wherein the clearance (S) makes available a fluid connection to a fluid region (P 23 , P 21 ) assigned to the exterior of the pressure equalizing insert ( 1 ). 
     
     
       10. The valve ( 10 ) according to  claim 1 , characterized in that a fluid region (P 23 ) assigned to the exterior of the pressure equalizing insert ( 1 ) is fluidically connected to the exterior of the housing ( 2 ) via one or more openings ( 2   d ) in a wall of the housing ( 2 ). 
     
     
       11. The valve ( 10 ) according to  claim 1 , characterized in that a section ( 21 ) of the housing ( 2 ) of the pressure equalizing insert ( 1 ) has on the inlet end a peripheral groove to receive a sealing element ( 134 ) which is equipped for sealing with respect to the housing of the valve ( 10 ). 
     
     
       12. The valve ( 10 ) according to  claim 1 , characterized in that a section ( 23 ) of the housing ( 2 ) has on the outlet end an annular groove to receive a sealing insert ( 131 ) for the valve element ( 12 ) of the valve ( 10 ). 
     
     
       13. The valve ( 10 ) according to  claim 1 , characterized in that the actuating member ( 3 ) has a lip-shaped region ( 32 ) whose dimensions result in the flow-through rate through the valve ( 10 ) being independent of the pressure (P 1 ) at the inlet end. 
     
     
       14. The valve ( 10 ) according to  claim 1 , characterized in that a clearance (S) is formed between the housing ( 2 ) of the pressure equalizing insert ( 1 ) and a housing of the valve ( 10 ), said clearance (S) being provided for establishing a fluid connection to a fluid region (P 23 , P 21 ) assigned to the exterior of the pressure equalizing insert ( 1 ) and being designed so that the penetration of dirt into the pressure equalizing insert ( 1 ) is reduced and/or a hydraulic damping of the movement of the actuating member ( 3 ) of the pressure equalizing insert ( 1 ) is induced. 
     
     
       15. The valve ( 10 ) according to  claim 1 , characterized in that a first valve housing part ( 8 ) is equipped to accommodate a valve element ( 12 ) and the pressure equalizing insert ( 1 ), wherein a second valve housing part ( 9 ) is equipped for securing the pressure equalizing insert ( 1 ) in the first valve housing part ( 8 ), wherein the first and second valve housing parts ( 8 ,  9 ) are equipped so that an operative connection ( 11 ) can be established between the first and the second valve housing parts ( 8 ,  9 ). 
     
     
       16. The valve ( 10 ) according to  claim 1 , wherein the valve ( 10 ) comprises a first valve housing part ( 8 ) and a second valve housing part ( 9 ), which make up a valve housing, and wherein the first valve housing part ( 8 ) is configured to receive said preassembled pressure equalizing insert ( 1 ) and the second valve housing part ( 9 ) fixes said preassembled pressure equalizing insert ( 1 ) in said first valve housing part ( 8 ).